asymetric-encryption in pure PHP ???

Hello ! I need to do asymetric-encryption (using two keys ...) in PHP but it need to be pure PHP, so no module to compile into the PHP or such things ... Exactly I only need the encryption/decryption in pure PHP, the key-generation can be a C-program or so too. Any ideas out there ??? Or does anyone have done this already ? Would be great if I could get an answer. Please reply to me personally too (apollon@schlund.de) !! Ingo F

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